public class FixedSizeMap extends AbstractMapDecorator implements Map, BoundedMap, Serializable
Map to fix the size, preventing add/remove.
Any action that would change the size of the map is disallowed. The put method is allowed to change the value associated with an existing key however.
If trying to remove or clear the map, an UnsupportedOperationException is thrown. If trying to put a new mapping into the map, an IllegalArgumentException is thrown. This is because the put method can succeed if the mapping's key already exists in the map, so the put method is not always unsupported.
Note that FixedSizeMap is not synchronized and is not thread-safe.
If you wish to use this map from multiple threads concurrently, you must use
appropriate synchronization. The simplest approach is to wrap this map
using Collections.synchronizedMap(Map). This class may throw
exceptions when accessed by concurrent threads without synchronization.
This class is Serializable from Commons Collections 3.1.
map| Modifier | Constructor and Description |
|---|---|
protected |
FixedSizeMap(Map map)
Constructor that wraps (not copies).
|
| Modifier and Type | Method and Description |
|---|---|
void |
clear() |
static Map |
decorate(Map map)
Factory method to create a fixed size map.
|
Set |
entrySet() |
boolean |
isFull()
Returns true if this map is full and no new elements can be added.
|
Set |
keySet() |
int |
maxSize()
Gets the maximum size of the map (the bound).
|
Object |
put(Object key,
Object value) |
void |
putAll(Map mapToCopy) |
Object |
remove(Object key) |
Collection |
values() |
containsKey, containsValue, equals, get, getMap, hashCode, isEmpty, size, toStringclone, finalize, getClass, notify, notifyAll, wait, wait, waitcontainsKey, containsValue, equals, get, hashCode, isEmpty, sizeprotected FixedSizeMap(Map map)
map - the map to decorate, must not be nullIllegalArgumentException - if map is nullpublic static Map decorate(Map map)
map - the map to decorate, must not be nullIllegalArgumentException - if map is nullpublic Object put(Object key, Object value)
put in interface Mapput in class AbstractMapDecoratorpublic void putAll(Map mapToCopy)
putAll in interface MapputAll in class AbstractMapDecoratorpublic void clear()
clear in interface Mapclear in class AbstractMapDecoratorpublic Object remove(Object key)
remove in interface Mapremove in class AbstractMapDecoratorpublic Set entrySet()
entrySet in interface MapentrySet in class AbstractMapDecoratorpublic Set keySet()
keySet in interface MapkeySet in class AbstractMapDecoratorpublic Collection values()
values in interface Mapvalues in class AbstractMapDecoratorpublic boolean isFull()
BoundedMapisFull in interface BoundedMaptrue if the map is fullpublic int maxSize()
BoundedMapmaxSize in interface BoundedMapCopyright © 2001–2015 The Apache Software Foundation. All rights reserved.